diff --git a/src/fellchensammlung/tools/geo.py b/src/fellchensammlung/tools/geo.py
new file mode 100644
index 0000000..cad9ac3
--- /dev/null
+++ b/src/fellchensammlung/tools/geo.py
@@ -0,0 +1,38 @@
+import requests
+import json
+from notfellchen import __version__ as nf_version
+
+
+class ResponseMock:
+    content = b'[{"place_id":138181499,"licence":"Data \xc2\xa9 OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"relation","osm_id":1247237,"lat":"48.4949904","lon":"9.040330235970146","category":"boundary","type":"postal_code","place_rank":21, "importance":0.12006895017929346,"addresstype":"postcode","name":"72072","display_name":"72072, Derendingen, T\xc3\xbcbingen, Landkreis T\xc3\xbcbingen, Baden-W\xc3\xbcrttemberg, Deutschland", "boundingbox":["48.4949404","48.4950404","9.0402802","9.0403802"]}]'
+
+    def json(self):
+        return json.loads(self.content.decode())
+
+
+class RequestMock:
+    @staticmethod
+    def get(url, params=None, data=None, headers=None):
+        return ResponseMock()
+
+
+class GeoAPI:
+    def __init__(self, debug=True):
+        self.api_url = "https://nominatim.openstreetmap.org/search"
+        if debug:
+            self.requests = RequestMock
+        else:
+            self.requests = requests
+
+    def get_coordinates_from_postcode(self, postcode):
+        headers = {
+            'User-Agent': f"Notfellchen {nf_version}",
+            'From': 'info@notfellchen.org'  # This is another valid field
+        }
+        result = self.requests.get(self.api_url, {"q": postcode, "format": "jsonv2"}, headers=headers).json()[0]
+        return result["lat"], result["lon"]
+
+
+if __name__ == "__main__":
+    geo = GeoAPI(debug=True)
+    print(geo.get_coordinates_from_postcode("72072"))